CAS is AD Site aware.
Therefore just putting another CAS in another AD site will not be enough.

Two things happens - Autodiscover tell the clients where to go.
Then the RPC CAS Array is the address returned. The RPC CAS array should be configured from the start. If you are moving mailboxes to that other location and it is across AD site then they will get the new address automatically.

Yes that what we have right now one CAS server but, our network is changing so I have to built another CAS server. The new CAS server will be on the same site but different network. So, I just wanted to make sure that by introducing a new CAS server I do not mess anything up. After installing the new CAS i will point the databases to the new CAS and remove the other CAS.

So, all I need to know is by introducing a new CAS how exchange is going to behave? Will autodisover say here is a new CAS box let me use it; or nothing will happen until I issue the above command?

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